Nurturing Life Sciences
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#Id: 623
#Unit 2. Cellular Organization
Dual hairpin formation take place due to ribosome fall from UGA
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Dual hairpin formation (Region 3-4 forms hairpin then second hairpin is formed between Region 1-2) release RNA-DNA hybrid and RNA Polymerase causes seizing transcription of trp operon at high trp concentration.
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Attenuator riboswitch (Leader sequence) region 1 is translated atleast till codon 10 and 11 in case of Low trp concentration because ribosomes get stalled due to low availability of charged tRNA-trp
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In case of Low trp concentration, RNA polymerase continues to EDCBA genes where new ribosome get attached to AUG of polycistronic genes
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RNA Polymerase don’t get dissociated with one hairpin which is 2:3
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Transcription is initiated at the beginning of the 162 nucleotide mRNA leader encoded by a DNA region called trpL.